Etymology
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intimacy (n.)

1640s, from intimate (adj.) + abstract noun suffix -cy. Sense of "sexual intercourse" attested from 1670s but modern use is from newspaper euphemistic use (1882).

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Definitions of intimacy

intimacy (n.)
close or warm friendship;
the absence of fences created a mysterious intimacy in which no one knew privacy
Synonyms: familiarity / closeness
intimacy (n.)
a usually secretive or illicit sexual relationship;
Synonyms: affair / affaire / liaison / involvement / amour
intimacy (n.)
a feeling of being intimate and belonging together;
Synonyms: closeness
From wordnet.princeton.edu